In college, I used sticky blue putty to stick posters to the dorm room walls. It worked great! I got older and forgot all about the blue stuff until my class on Friday when Pam (a very smart student!) showed me how she used the blue stuff to stick upholstery vinyl to her pattern. The small blue dots held the vinyl firmly in place while she traced her overlay.
It comes off without harming either the paper or the vinyl. You can save it and use it over and over. Thanks for the tip, Pam!